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Cooling water flow acquisition method and correction method for hot-rolled alloy steel laminar flow cooling jet header

A technology of cooling water flow rate and laminar flow cooling, which is applied in workpiece cooling devices, metal rolling, metal rolling, etc., and can solve the problem of low feed-forward control accuracy of rolled piece temperature and large preset error of cooling water flow rate in injection header , Cooling rate is difficult to control and other problems, to achieve the effect of fewer assumptions and simplified conditions, faster calculation speed, and improved control accuracy

Active Publication Date: 2022-03-15
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, and provide a cooling water flow acquisition method and correction method for the hot-rolled alloy steel laminar flow cooling injection header, which is used to solve the problem of cooling speed in the laminar flow cooling process of hot-rolled alloy steel It is difficult to control, and the large error in the preset cooling water flow rate of the injection header leads to the problem of low precision of the feedforward control of the temperature of the rolled piece

Method used

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  • Cooling water flow acquisition method and correction method for hot-rolled alloy steel laminar flow cooling jet header
  • Cooling water flow acquisition method and correction method for hot-rolled alloy steel laminar flow cooling jet header
  • Cooling water flow acquisition method and correction method for hot-rolled alloy steel laminar flow cooling jet header

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Embodiment 1

[0078] see figure 1 , the embodiment of the invention provides a cooling water flow acquisition method for hot-rolled alloy steel laminar flow cooling injection header, comprising the following steps:

[0079] S1. Construct the process layout of the laminar flow cooling system, and obtain the process parameters, including the number of spray headers, the center position of each spray header, the spray width, the length of the spray area and the maximum cooling water flow, the thickness, width and speed of the rolled piece , initial temperature and thermophysical parameters.

[0080] S2. Establish the relationship between the water-cooling heat transfer coefficient and the water-cooling flow density; the establishment of the relationship between the water-cooling heat transfer coefficient and the water-cooling flow density is obtained by the water-cooling test, and the corresponding water cooling under the corresponding water-cooling flow density is calculated by the linear int...

Embodiment 2

[0151] In this embodiment, the hot-rolled alloy steel 40CrMoV is taken as an example. On the basis of the method described in Embodiment 1, the preset value of the cooling water flow rate of each spray header in the laminar cooling process is calculated, and the temperature value measured on the spot is compared with A comparison is made to further illustrate the versatility and accuracy of the method of the present invention. The process layout of the laminar flow cooling system is as follows: image 3 As shown, the number of injection headers is 34, and the number from the laminar flow cooling inlet to the outlet is 1# to 34#. The serial number, center position, spray width, spray area length and maximum cooling water flow of each injection header are shown in the table 1 As shown in the first column to the fifth column, the thickness of the rolled piece is 2mm, the width is 1600mm, the initial temperature is 880°C, the thermal conductivity of the rolled piece is 34W / (m×°C),...

Embodiment 3

[0163] An embodiment of the present invention provides a cooling water flow correction method for a hot-rolled strip laminar flow cooling injection header, which includes the following steps:

[0164] SS1. After each injection header is turned on, judge whether the existing cooling water flow of the injection header reaches the maximum flow rate. If the existing cooling water flow rate of the injection header does not reach the maximum flow rate, correct the cooling water flow of the injection header. For water flow rate, change the cooling water flow rate once every time it is corrected, and then go to step SS2; The cooling water flow preset value of the tube, and open the next injection header to make corrections;

[0165] SS2. When judging whether the difference between the surface temperature of the rolled piece at the specified position and the target cooling temperature satisfies the cooling temperature control accuracy, if the difference between the surface temperature ...

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Abstract

The invention relates to a method for acquiring and correcting cooling water flow of a hot-rolled alloy steel laminar cooling jet header, which comprises the following steps of: establishing a two-dimensional rolled piece temperature field calculation model in a laminar cooling process through theoretical analysis by adopting a sparse interval cooling mode, and calculating the cooling water flow of the hot-rolled alloy steel laminar cooling jet header according to the established relationship between a water-cooling heat transfer coefficient and water-cooling flow density. And adopting a temperature calculation model to calculate the temperature distribution of the section of the rolled piece, and adopting an optimization algorithm to sequentially correct the cooling water flow of each injection header according to the difference value between the surface temperature of the rolled piece at the calculation termination position and the target cooling temperature, so as to ensure that the calculated temperature of the rolled piece is matched with the target temperature. The method is suitable for on-line presetting calculation of the cooling water flow of each injection header in the hot-rolled alloy steel laminar cooling process, so that the temperature of a rolled piece is reduced to be close to the nose temperature of a pearlite phase change area at a moderate cooling speed, the control precision of the hot-rolled alloy steel laminar cooling temperature is improved, and pearlite and dispersed and fine carbonitride structures are obtained.

Description

technical field [0001] The invention belongs to the technical field of hot rolling, and in particular relates to a cooling water flow acquisition method and a correction method of a hot-rolled alloy steel laminar cooling injection header. Background technique [0002] The laminar flow cooling device is the key equipment to control the cooling temperature of the hot-rolled strip to achieve precise control of the microstructure. Its layout is mainly composed of a certain number of injection headers and control valves. flow, to achieve temperature control of the rolled piece. [0003] The microstructure of hot-rolled alloy steel products includes pearlite and dispersed fine carbonitrides. The post-rolling cooling process mainly includes two stages: first, cooling to the "nose temperature" of the pearlite transformation zone at an appropriate cooling rate, and then Air-cool to the target cooling temperature in the pearlite phase transition zone. Among them, the cooling rate in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/76B21B45/02
CPCB21B37/76B21B45/0233B21B45/0218B21B2261/20Y02P70/10
Inventor 陈全忠
Owner WISDRI ENG & RES INC LTD
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